I have an old Canon NP 2120 copier. The error shows 004, which indicate fuser problem. A while back, when a service man visited me to fix something else, he told me that the drum need to be changed. So I bought one from him to change it later when it would show problem.
Now, I think, I need to change the drum, but I forgot how to change it. He showed me how, but it was a long ago. Could you help me how to change the drum?
Thank you very much.
Below, I used NP6050 copier because I could not find my copier name, NP 2120.
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According to the copier error code this is the problem of abnormal fuser temp.
First check the electric outlet, where you have plugged the copier and also
check the dc controller. Then fix the heater & ac driver also.
not a Canon Copier Tec but I know E04's on Canons generally means
heat/fuser error - ie fuser, usally fuser lamp, thermister or thermal
fuse. Have fuser replaced.
Have it looked at, due to it requiring electrical knowledge, ie test
heater lamp(open), thermal fuse(open), thermister(check for toner built
up on face) with the user removed from printer (fuser=hot bit that paper
goes threw, just before where paper exits to go to sorter) or just
There maybe a reset required, on some canon models after problem has been fixed.
Abnormal fuser temp. (fixing heater, dc controller, ac driver) http://rapidshare.com/files/161024133/NP6050sm.rar That link above is for a service manual. Copy/Paste that address to address bar..
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A E004 deals with the fuser unit. Have you looked at the Thermister or the thermal fuse or the fixing lamps? I would say that most likely you have a blown or shorted thermister. One of the wires may have come off the pcb.. I you want to see the error code, I believe it is under *6* counters... *4* is for resetting the code
Subject:E840 Indicated in response to damage on the Fixing Roller Trust StopDetails:<Problem>Damage to the Fixing Roller Thrust Stop leads to the indication of error code E840. At times, it can also indicatecode E001/E004.<Cause>The strength of the Fixing Roller Thrust Stop  is not adequate and over time, it tends to show damage, failingto prevent the Fixing Roller from moving to and from. Or, the damaged stop can fall to the Shutter DriveAssembly to cause the shutter to malfunction, also resulting in an error. <Factory Measure>Modify the method used to shape the fixing roller thrust stop to increase its durability. Servicing Work:If any of the foregoing symptoms is noted, or in the course of a service visit, replace the existing Fixing RollerThrust Stop with its new type.